html {
  font-size: 26.6667vw; //相对单位：rem vw
  //视图宽度375 , 100vw
  //1vw = 375/100 = 3.75 px
  //100px = 100/3.75 = 26.6667vw
  height: 100%;
}
body {
  font-size: 0.14rem;
  height: 100%;
}

html,
body,
nav,
ul,
h2,
h3,
h4,
p,
li {
  padding: 0;
  margin: 0;
}
